Yates, Robert C. 1904-1963. The trisection problem. - Washington, DC: National Council of Teachers of Mathematics, [1971]. - xii, 68 p.: ill., 24 cm. - Classics in mathematics education; v. 3. . - Classics in mathematics education; 3. . "First published in 1942." Bibliography: p. [67]-68. LCCN: 77176232 //r90 Subjects--Topical Terms: Trisection of angle Dewey Class. No.: 516.204